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This article is a list of diseases of rhododendron (Rhododendron spp.). Bacterial diseases. Bacterial diseases; Crown gall Agrobacterium tumefaciens: Fungal diseases
Major diseases include Phytophthora root rot, stem and twig fungal dieback. [60] Rhododendron bud blast, a fungal condition that causes buds to turn brown and dry before they can open, is caused by the fungus Pycnostysanus azaleae, which may be brought to the plant by the rhododendron leafhopper, Graphocephala fennahi. [61]: 562
The spores of the fungus hibernate on Rhododendron species. In spring and summer, it migrates to spruce and infects recently emerged needles, coloring them in yellow. In autumn, the spores that developed on spruce infects the rhododendron again. [1]
Exobasidium vaccinii, commonly known as “red leaf disease,” or “Azalea Gall,” is a biotrophic species of fungus that causes galls on ericaceous plant species, such as blueberry and azalea (Vaccinium and Rhododendron spp.). Exobasidium vaccinii is considered the type species of the Exobasidium genus. [1]
One to 20 (commonly two to five) small, black sclerotia (a fungal resting stage) form on an infected flower 6–8 weeks later. They appear first as small white areas on the dried petals and slowly become dark as they mature. Caused by the Ovulinia azaleae fungus, the disease develops during periods of moist weather at flowering time. Early- and ...
Why Your Rhododendron's Leaves Are Rolling Up and Wilting (And What to Do About It) April 23, 2021 at 12:03 PM. Droopy or curled up foliage on this shrub is a sure sign your plant isn't happy ...
Hymenanthes, with approximately 225 species, and subgenus Rhododendron, with approx. 400 species, comprise what gardeners typically describe as "Rhododendrons." Two subgenera are generally known to gardeners as "Azaleas", and include many fewer true species: Pentanthera , which comprises the deciduous azaleas, and Tsutsusi , which includes ...
Rhododendron ponticum showing classic symptoms of Phytophthora kernoviae in the UK. Phytophthora (from Greek φυτόν (phytón), "plant" and φθορά (phthorá), "destruction"; "the plant-destroyer") is a genus of plant-damaging oomycetes (water molds), whose member species cause economic losses on crops worldwide, as well as environmental damage in natural ecosystems.